IEC 61937-7:2004/AMD1:2016

Amendment 1 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats

Amendement 1 - Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire conformément à l'IEC 60958 - Partie 7: Flux de bits MIC non linéaire selon les formats ATRAC, ATRAC2/3 et ATRAC-X

General Information

• Status: Published
• Publication Date: 12-May-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: PPUB - Publication issued
• Start Date: 31-May-2016
• Completion Date: 13-May-2016

Relations

• Amends: IEC 61937-7:2004 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying to IEC 60958 - Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61937-7
®

Edition 2.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 1
AM ENDEMENT 1

Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
to IEC 60958 –
Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and
ATRAC-X formats

Audionumérique – Interface pour les flux de bits audio à codage MIC non
linéaire conformément à l’IEC 60958 –
Partie 7: Flux de bits MIC non linéaire selon les formats ATRAC, ATRAC2/3 et
ATRAC-X

IEC 61937-7:2004-11/AMD1:2016-05(en-fr)

---------------------- Page: 1 ----------------------
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IEC 61937-7

®


Edition 2.0 2016-05




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE




AM ENDMENT 1

AM ENDEMENT 1





Digital audio – Interface for non-linear PCM encoded audio bitstreams applying

to IEC 60958 –

Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and


ATRAC-X formats



Audionumérique – Interface pour les flux de bits audio à codage MIC non


linéaire conformément à l’IEC 60958 –

Partie 7: Flux de bits MIC non linéaire selon les formats ATRAC, ATRAC2/3 et

ATRAC-X










INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.160.01 ISBN 978-2-8322-3284-2



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – IEC 61937-7:2004/AMD1:2016
© IEC 2016

FOREWORD
This amendment has been prepared by technical area 4: Digital system interfaces and
protocols of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
100/2503/CDV 100/2614/RVC

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

_____________

Insert, after the FOREWORD, the following new INTRODUCTION:

INTRODUCTION to Amendment 1
The revision of IEC 61937-7:2004 has become necessary to specify the new additional
subdata-types of ATRAC-X low latency. This amendment includes the following technical
changes:
a) new three subdata-types of ATRAC-X low latency are defined;
b) specific properties such as reference points, repetition period, and decoding latency are
specified for each subdata-type of ATRAC-X.

4.2 ATRAC, ATRAC2/3 and ATRAC-X burst-info
Replace the existing Table 1 by the following new table:

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IEC 61937-7:2004/AMD1:2016 – 3 –
© IEC 2016
Table 1 – Fields of burst-info
Repetition period
Bits of Pc Value Contents Reference point R of data-burst in
IEC 60958 frames
0-4 Data-type
0-13 In accordance with IEC 61937-1 and IEC 61937-2
14 ATRAC bit 0 of Pa 512
15 ATRAC2/3 bit 0 of Pa 1 024
16 ATRAC-X Subdata-type Subdata-type
dependent dependent
17-31 In accordance with IEC 61937-2

5, 6 00 Reserved in ATRAC and ATRAC2/3 formats
2
00 Subdata-type for ATRAC-X bit 0 of Pa 2 048
2
01 Subdata-type for ATRAC-X low latency bit 0 of Pa 512
2
10 Subdata-type for ATRAC-X low latency bit 0 of Pa 256
2
11 Subdata-type for ATRAC-X low latency bit 0 of Pa 128
2
7-15 In accordance with IEC 61937-1 and IEC 61937-2

5.2.5 The data ATRAC-X
Replace the existing first paragraph by the following new text:
The burst-payload of each data-burst of ATRAC-X data shall contain one complete ATRAC-X
frame, and represents 2 048, 512, 256 or 128 samples for each encoded channel.
Replace the NOTE above Figure 5 as follows:
NOTE The reference to the specification for the ATRAC-X bitstream, representing 2 048, 512, 256 or 128 samples
of encoded audio per frame, may be found in the Bibliography.
Replace the first paragraph after Table 4 by the following:
The reference point of an ATRAC-X data-burst is bit 0 of Pa and shall occur exactly once
every 2 048, 512, 256 or 128 sampling periods. The data-burst containing ATRAC-X frames
shall occur at a regular rate, with the reference point of each ATRAC-X data-burst beginning
2 048, 512, 256 or 128 IEC 60958 frames after the reference point of the preceding ATRAC-X
data-burst (of the same bit-stream-number).
Replace the second paragraph after Table 4 by the following:
When a stream gap in an ATRAC-X stream is filled by a sequence of Pause data-bursts, the
Pa of the first Pause data-burst shall be located 2 048, 512, 256 or 128 sampling periods
following the Pa of the previous ATRAC-X frame.

5.2.6 Latency of ATRAC-X decoding
Replace the ultimate paragraph of this subclause by the following new paragraphs:
The latencies of each subdata-type ATRAC-X and ATRAC-X low latency are calculated as
follows.

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– 4 – IEC 61937-7:2004/AMD1:2016
© IEC 2016
EXAMPLE 1 (ATRAC-X subdata-type 0) In this case, the sampling period is 2 048. The length of preamble is
64 bit. If each ATRAC-X frame consists of a maximum bit rate of 352,8 kbit/s, the maximum length of the whole
data burst-payload is 16 384 bit. In this case, the whole length of the data burst is 16 448 bit. The receiving delay
time is calculated as 11,66 ms with 44,1 kHz sampling frequency. The decoding delay time is calculated as
46,44 ms, and is equal to the decoding time for one ATRAC-X frame data. Hence, the latency of ATRAC-X
decoding is approximately 58,10 ms in this case.
The absolute maximum decoding latency is taken when ATRAC-X burst-payload extends to
just before the Pa of the next frame and is equal to 92,88 ms at 44,1 kHz sampling frequency.
EXAMPLE 2 (ATRAC-X low latency subdata-type 1) In this case, the sampling period is 512. The length of
preamble is 64 bit. If each ATRAC-X low latency subdata-type 1 frame consists of bit rate of 990 kbit/s, the length
of the whole data burst-payload is 2 640 bit. In this case, the whole length of the data burst is 2 704 bit. The
receiving delay time is calculated as 0,44 ms with 192 kHz sampling frequency. The decoding delay time is
calculated as 2,66 ms, and is equal to the decoding time for one ATRAC-X low latency subdata-type 1 frame data.
Hence, the latency of ATRAC-X low latency subdata-type 1 decoding is approximately 3,10 ms in this case.
The absolute maximum
...